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I suspect it’s a cost/capability/requirements thing.
The larger the corporation, the more likely they’re going to have SSO as a minimum requirement. The more inflexible your customers are, the more you can charge.
That’s more or less it.
For example, I’ve got somewhere around 700 users. If we don’t have SSO (SAML preferred, oauth as a fall back, and good whiskey is required for ldap/ad) whatever your attempting to buy won’t pass review. Now Timmy the sales drone knows that, and so does their leadership - hence the SSO tax.
Entra’s free tier offers federated / SSO so basically every company with an MS license (which is an overwhelming majority, in my experience) can do SSO if they wanted to.